I have purchased a Samsung T10 MP3 player but cannot find any instruction
manual. In particular I need info on the use of the microphone to record.
Any info on locating the instruction manual would be appreciated . Regards

To use the voice recorder go to "Prime Pack" > "Voice REC" then simply press the middle button to start recording and again to stop. It'll then save it and ask if you want to play it back.

To access the file later just head to the "File Browser" > "Recorded Files" and it'll have "VCE_###.MP3", what ### is depends on how many other recordings you've got in the folder. If you record FM radio the file will be called "FM_###.MP3"